I've never subscribed to the idea that there exists a zero-sum relationship between nature and culture, but this short essay takes another crack at the idea. It's true that leaders in government probably don't get out much, but I'm less pessimistic than some. At least President Obama has Camp David as a convenient retreat. From this perspective, we should perhaps rethink our scorn of George W. Bush's long weeks spent clearing brush on his ranch.
The book Ecopsychology effectively lays out the benefits of natural environments on individuals, and I'm still searching for a contrasting defense of urban life. No doubt that on the aggregate, though, cities are environmentally beneficial, reducing a population's ecological footprint through density and scale efficiencies.